[Resolved] Default translation engine: Failed to load engines

Problem:
The client is unable to perform translations due to errors related to the 'Default translation engine' failing to load and issues copying translation information to a new URL after migrating a site manually using an SQL file.

Solution:
1. Ensure the 'WPML String Translation' plugin is installed and enabled as it is necessary for using the Advanced Translation Editor and for translating strings from ACF, Yoast SEO, themes, or other plugins.
2. When encountering issues with fields not showing up for translation, verify that each field name is unique across various blocks or field groups. More information on this can be found here: https://wpml.org/documentation/related-projects/translate-sites-built-with-acf/
3. For errors related to URL mismatches after site migration, try editing the original content, saving it, and running the translation again. If the issue persists, it may be due to completing a job on one site URL and reviewing it on another, leading to URL errors.

If these steps do not resolve your issues or if the solution seems outdated or irrelevant to your case, we recommend opening a new support ticket. We also highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. For further assistance, please visit our support forum at https://wpml.org/forums/forum/english-support/.